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    題名: Novel reaction mechanism for the synthesis of Ba2Ti9O20 materials prepared from nano-sized oxides
    作者: 林諭男;Lin, I-nan;朱立文;Chu, Li-wen;Hsiue, Ging-ho;Lin, I-nan;Chen, Yi-chun
    貢獻者: 淡江大學物理學系
    日期: 2006-01-14
    上傳時間: 2009-12-31 10:38:19 (UTC+8)
    出版者: Institute of Physics (IOP)
    摘要: In this work, the phase evolution during calcinations of a BaTiO3 and TiO2 mixture was investigated. Based on the observations, a model for the reaction sequence of the phases was proposed and a modified process was suggested, namely to synthesize Ba2Ti9O20 materials utilizing a BaTi4O9 and BaTi5O11 mixture, instead of a BaTiO3 and TiO2 mixture, as starting materials. The phase transformation kinetics is thus greatly enhanced by this process. While the reaction of the 2BaTiO3+7TiO2 mixture requires 1100 °C/4 h to transform completely into the Ba2Ti9O20 Hollandite-like phase, it needs only 1000 °C/4 h to fulfil the phase transformation process in the BaTi5O11+BaTi4O9 mixture. The BaTi5O11+BaTi4O9 mixture also leads to higher sinterability and more uniform granular structure, as compared to the 2BaTiO3+7TiO2 mixture, when these powder mixtures were densified by a direct sintering process. Furthermore, local microwave dielectric properties measured by an evanescent microwave probe (EMP) reveals that the grains of Ba2Ti9O20 materials prepared from the BaTi5O11+BaTi4O9 mixture possess larger dielectric constant than 2BaTiO3+7TiO2 derived ones, indicating that the BaTi5O11+BaTi4O9 mixture has higher reactivity for the formation of the Ba2Ti9O20 Hollandite-like phase.
    關聯: Nanotechnology 17(1), pp.185-191
    DOI: 10.1088/0957-4484/17/1/030
    顯示於類別:[物理學系暨研究所] 期刊論文

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